Paper: GS – III, Subject: Science and Technology, Topic: Space Technology, Issue: Chandrayaan-3 Hop Experiment and Lunar Surface Layers.
Context:
The Chandrayaan-3 lander’s short “hop” experiment has provided important scientific information about the upper surface of the Moon. Data from the ChaSTE instrument suggests that the lunar surface has two distinct layers within just a few centimetres.
Key Takeaways:
Explanation:
1. Discovery of Two Surface Layers:
- The experiment revealed that the Moon’s upper surface is not uniform.
- A very thin upper layer, about 2–3 cm, appears to be loosely packed and easily disturbed.
- Below it lies a denser layer, beginning roughly around 6 cm depth.
- This shows that even the top few centimetres of lunar regolith have different physical properties.
2. Importance of the Hop Experiment:
- The rocket plume during the hop displaced the loose upper soil.
- This exposed the lower layer and allowed ChaSTE to collect fresh thermal data.
- Earlier data mainly reflected the undisturbed surface, but the hop created an opportunity to study newly exposed subsurface material.
3. Scientific and Mission Value:
- The findings help scientists understand the thermal behaviour, compactness, and layering of lunar regolith.
- The temperature was found to fall sharply with depth, showing that the Moon’s subsurface can behave very differently from its surface.
- Such information is important for designing landers, rovers, drilling systems, and future lunar bases.
- It can also help assess possible locations where water ice may remain stable.
Conclusion:
The Chandrayaan-3 hop experiment became more than a technology demonstration. It provided valuable evidence about the Moon’s near-surface structure and thermal conditions. This knowledge will support future lunar exploration, resource assessment, and long-term human missions.
Source: (The Indian Express)
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